$0281-$0282/641-642: Pointer: Bottom of Memory for Operating System
Default Value is $0800
Kernal-Reference:
LDX $0281 : $FE36
STX $0281 : $FE3C
LDY $0282 : $FE39
STA $0282 : $FD92
STY $0282 : $FE3F
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